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x in (-oo:+oo)
7/12 = x/12 // - x/12
7/12-(x/12) = 0
7/12-1/12*x = 0 // - 7/12
-1/12*x = -7/12 // : -1/12
x = -7/12/(-1/12)
x = 7
x = 7
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